CY54FCT646T, CY74FCT646T

8-BIT REGISTERED TRANSCEIVERS

WITH 3-STATE OUTPUTS

SCCS031A – JULY 1994 – REVISED OCTOBER 2001

8

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

timing requirements over recommended operating free-air temperature range (unless otherwise

noted) (see Figure 2)

CY54FCT646T

CY54FCT646AT

CY54FCT646CT

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tw

Pulse duration

6

5

5

ns

tsu

Setup time, data before CPAB

↑ or CPBA↑

4.5

2

2

ns

th

Hold time, data after CPAB

↑ or CPBA↑

2

1.5

1.5

ns

timing requirements over recommended operating free-air temperature range (unless otherwise

noted) (see Figure 2)

CY74FCT646T

CY74FCT646AT

CY74FCT646CT

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tw

Pulse duration

6

5

5

ns

tsu

Setup time, data before CPAB

↑ or CPBA↑

4

2

2

ns

th

Hold time, data after CPAB

↑ or CPBA↑

2

1.5

1.5

ns

switching characteristics over operating free-air temperature range (see Figure 2)

PARAMETER

FROM

TO

CY54FCT646T

CY54FCT646AT

CY54FCT646CT

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tPLH

AorB

BorA

2

11

2

7.7

1.5

6

ns

tPHL

A or B

B or A

2

11

2

7.7

1.5

6

ns

tPZH

DIR

AorB

2

15

2

10.5

1.5

8.9

ns

tPZL

DIR

A or B

2

15

2

10.5

1.5

8.9

ns

tPHZ

G and DIR

AorB

2

11

2

7.7

1.5

7.7

ns

tPLZ

G and DIR

A or B

2

11

2

7.7

1.5

7.7

ns

tPLH

CPAB or CPBA

AorB

2

10

2

7

1.5

6.3

ns

tPHL

CPAB or CPBA

A or B

2

10

2

7

1.5

6.3

ns

tPLH

SBA or SAB

AorB

2

12

2

8.4

1.5

7

ns

tPHL

SBA or SAB

A or B

2

12

2

8.4

1.5

7

ns

switching characteristics over operating free-air temperature range (see Figure 2)

PARAMETER

FROM

TO

CY74FCT646T

CY74FCT646AT

CY74FCT646CT

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

tPLH

AorB

BorA

1.5

9

1.5

6.3

1.5

5.4

ns

tPHL

A or B

B or A

1.5

9

1.5

6.3

1.5

5.4

ns

tPZH

DIR

AorB

1.5

14

1.5

9.8

1.5

7.8

ns

tPZL

DIR

A or B

1.5

14

1.5

9.8

1.5

7.8

ns

tPHZ

G and DIR

AorB

1.5

9

1.5

6.3

1.5

6.3

ns

tPLZ

G and DIR

A or B

1.5

9

1.5

6.3

1.5

6.3

ns

tPLH

CPAB or CPBA

AorB

1.5

9

1.5

6.3

1.5

5.7

ns

tPHL

CPAB or CPBA

A or B

1.5

9

1.5

6.3

1.5

5.7

ns

tPLH

SBA or SAB

AorB

1.5

11

1.5

7.7

1.5

6.2

ns

tPHL

SBA or SAB

A or B

1.5

11

1.5

7.7

1.5

6.2

ns